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AQUATOP’s D2HT Digital Heater Series features a highly visible dual temperature display, an easy-to-use temperature control button, and a separately attached temperature sensor, providing a stable temperature environment for your aquatic life. The D2HT Series uses the latest digital technology for internal temperature control to keep aquarium temperatures steady. Advanced features include an automatic shut off margin set for 93°F to protect from overheating and internal memory that resumes preset temperatures after a power outage. A two millimeter thick glass tubes makes the D2HT line one of the strongest glass heaters on the market.

I have been using these heaters for over a year now. I find them to be very accurate and durable. It seams like all the ones that I have purchased have the same settings / calibration as other heaters made by this company. I have two of them in my 120 gallon tank, and they both cut in and shut off at the same time. They always maintain my reef tanks at the temp I set them to